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NWE Nos. 6 and 7

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NWE Nos. 6–7
Class 99.610
Type and origin
BuilderHenschel
Build date1914
Total produced2
Specifications
 • GermanK 33.11
Gauge1,000 mm (3 ft 3+3⁄8 in) metre gauge
Driver dia.800 mm (31.50 in)
Wheelbase:​
 • Overall2,500 mm (8 ft 2+3⁄8 in)
Length:
​
 • Over buffers7,734 mm (25 ft 4+1⁄2 in)
Width2,500 mm (8 ft 2+3⁄8 in)
Height3,650 mm (11 ft 11+3⁄4 in)
Adhesive weight32 t (31 long tons; 35 short tons)
Empty weight26 t (26 long tons; 29 short tons)
Service weight32 t (31 long tons; 35 short tons)
Fuel capacity1.1 t (1.1 long tons; 1.2 short tons) coal
Water cap.40 m3 (1,400 cu ft)
Firebox:​
 • Grate area1.4 m2 (15 sq ft);
1.5 m2 (16 sq ft) *
Boiler:
​
 • Small tubes88; 173 *
 • Large tubes18; 0 *
Boiler pressure14 bar (1.4 MPa; 200 psi)
Heating surface:​
 • Firebox4.76 m2 (51.2 sq ft);
5.06 m2 (54.5 sq ft) *
 • Total surface51.36 m2 (552.8 sq ft);
69.65 m2 (749.7 sq ft)
Superheater:
​
 • Heating area18.30 m2 (197.0 sq ft);
0 *
Cylinders2
Cylinder size430 mm (16.93 in),
400 mm (15.75 in)
Valve gearHeusinger with Kuhn slide
Train brakesKnorr m. Z.
Auxiliary brake
Parking brakecounterweight handbrake (de:Wurfhebel-Handbremse)
CouplersEqualising lever coupler (de:Balancierhebelkupplung)
Performance figures
Maximum speed30 km/h (19 mph)
Indicated power280 kW (381 PS; 375 hp);
220 kW (299 PS; 295 hp) *
Tractive effort:
​
 • Starting76.0 kN (7.75 Mp; 17,100 lbf),
65.9 kN (6.72 Mp; 14,800 lbf) *
Career
NumbersNWE Nos. 6–7
99 6101–6102
* No. 7 / 99 6102

NWE Nos. 6 and 7, later Class 99.610, are narrow gauge tank locomotives with a C axle arrangement that belonged to the Nordhausen-Wernigerode Railway.

The two engines had been supplied to the Army Technical Research Institute (Heerestechnische Prüfungsanstalt) but were transferred in 1917 (superheated steam engine) and 1921 (saturated steam engine) to the Nordhausen-Wernigerode Railway as NWE 6 and NWE 7.

NWE 7 had previously worked as Locomotive No. 15 with the Nassau Light Railway.

Until the 1980s, both engines were used around Wernigerode by the Deutsche Reichsbahn, their last duties being in Rollbock service. The DR gave them new numbers following their nationalisation. Although they had been taken out of service, the Harz Narrow Gauge Railways took both engines over.

  • Locomotive 99 6101, formerly NWE 6, now in the care of the Harz Narrow Gauge Railway Society (Interessengemeinschaft Harzer Schmalspurbahnen).
  • Locomotive 99 6102, formerly NWE 7, now in the care of the Selke Valley Railway Society (Freundeskreis Selketalbahn).

Only 99 6101 is currently in working order.

99 6101 takes on water
99 6101 heading a heritage train

Literature

  • Horst J. Obermayer: Taschenbuch Deutsche Schmalspur-Dampflokomotiven. Franckh, Stuttgart 1971, ISBN 3-440-03818-1
  • Hans Röper, Helmut Becker, Werner Dill, Gerhard Zieglgänsberger: Die Harzquer- und Brockenbahn. 3., erweiterte Auflage, Transpress Verlagsgesellschaft, Berlin 1992 ISBN 3-344-70747-7
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